Most contracts include a "soul-binding" clause that activates upon the human's death, meaning even if you win in life, you lose in the afterlife.
A classic trope where the debt is passed down to the next generation.
Do you need a specific focused on (e.g., Goetia, medieval folklore)? demon deals guide
The timeline of the deal. Does the mortal get twenty years of prosperity, or does the demon collect the debt the moment the wish is fulfilled?
Hire a lawyer who specializes in occult contract law. Find a comma out of place. Find an improper seal. Most demons are ancient and use Latin grammar. If you can prove the demon's signature is misspelled, the contract is void. The timeline of the deal
If you want to dive deeper into world-building or mechanics, let me know:
The Ultimate Demon Deals Guide: Risk, Reward, and Perfect Execution Find a comma out of place
A demon deal is only as strong as its wording. If you are entering into a pact, the "Terms and Conditions" are where the real danger lies.
Prove that the demon breached a minor clause first. If the contract promised "absolute health" and you catch a common cold, the contract is nullified.